单项选择题A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water ().

A.around the engine
B.around the cooler
C.to the expansion tank
D.overboard


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1.单项选择题The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ().

A.seawater contamination
B.frequent surface blows
C.dissolved oxygen deaeration
D.frequent bottom blows

2.单项选择题The water in an auxiliary boiler should be tested for chloride content to determine ().

A.total dissolved solids
B.salt contamination
C.water hardness
D.chlorine contamination

3.单项选择题Cooling the intake air supplied to a diesel engine will ().

A.reduce mean effective pressure
B.decrease average compression pressure
C.decrease air charge density
D.increase power output

4.单项选择题Excessive vibration of an automatically fired auxiliary boiler can be caused by ()

A.air or water in the furnace
B.combustion pulses
C.fuel oil pump failure
D.flame failure

5.单项选择题When there is a flame failure in an automatically fired auxiliary boiler, the ().

A.air supply is shut off
B.fuel supply is shut off
C.water supply is shut off
D.safety valve lifts

6.单项选择题If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe ().

A.high steam pressure in the boiler
B.abnormally high feed water temperature
C.abnormally high boiler water temperature
D.steam demand exceeding feed pump capacity

7.单项选择题Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?()

A.Clogged air intake falters
B.Piston blow-by
C.A defective after-cooler
D.Faulty exhaust valves

9.单项选择题The crankcase of many diesel engines are kept under a slight vacuum by the ().

A.scavenging action of the piston
B.piston type vacuum pump taking suction off a differential manometer
C.gland exhausting manometer
D.crankcase exhaust fan

10.单项选择题Fins are installed on the generating tube surfaces in waste heat boilers to ().

A.prevent soot fires in the exhaust system
B.prevent exhaust gas erosion of the tubes
C.increase the velocity of exhaust gas flow
D.increase the rate of heat transfer